Driving mechanism for paper-drying machines



Feb. 1, 1927.

B. A. MALKIN DRIVING MECHANISM FOR PAPER DRYING MACHINES Filed May 22, 1926 l 'aten ted Feb. .1, 1927.

UNITED STATES PATENT OFF-ICE.

BERNARD A. MALKIN, OF LACHINE, QUEBEC, CANADA.

DRIVING MECHANISM FOR PAPER-DRYING- MACHINES.'

Application filed May 22,

' pointin its progress .throughthe machine.

I am aware that individual motors have been proposed to drive each roll, but this has not been satisfactory as the drier felts are. depended upon to hold the surface speed of the drier rolls uniform, a condition which it'is impossible to obtain in the individual motor drives for machines using separate upper and lower felts. as the following reasons will disclose. The felts absorb moisture from the wet sheet of paper and stretch and when said felts dry, they shrink. It will be readily seen that when two separate felts are used that it is an impossibility to arrange a'maehine in which the stretching and shrinking of both felts will be uniform, so that the felts cannot be relied upon to carry the sheet at the'flsame surface speed through the drier sufficiently close' to avoid breaking the paper.

In myinventlon I overcome the above difliculties by using a single motor for driving one up or and one lower roll, so that the surface speed of the felts'may be more uniform and independent of the stretching or shrinking of the'felt. Each motor may be coupled up to drive anadjacent upper and. lower roll by any of the welllmown mechanical means, such. as spur gear drives,

bevel gear drives, worm gear drives, or .a combination of any of the aforementioned gears.

In the drawings which illustrate various forms of my invention;

Figure 1 is a part paper drying machine with each motor-driving one upper and one lower roll throughthe medium of bevel gearing.

Figure 2 is a part end elevation of the device shown in Figure 1.

Figure 3 is a part side elevation of a paper drying machine with each motor driv'- felt 12 whichis of the endless type passes side elevation of a 1926. Serial No. 110,927.

ing one upper and one lower roll through the medium of spur gearing.

Figure 4 isa part end elevation of the device shown in Figure 3.

Figure 5 is a part side elevation a paper drying machine with each motor urivingone upper and one lower roll through the medium of worm and worm gearing,

Figure 6 is a part end elevation of the device shown in Figure 5. v

Referring more particularly to the drawings, 11 designates the frame of the machine in which are rotatably mounted on suitable bearings, the upper rolls 12, the lower rolls 13, the guide rolls 14 and 15. The upper around the lowermost surface-of the guide rolls 14 and over the upper surfaces of the drier rolls' 12. The lower felt 13 passes over the upper side of the guide rolls 15 and the lower side of the drier rolls 13. The drier rolls are secured to suitable spindles 16 and 17, which may extend beyond the side of the frame for thepurpose hereinafter stated. The paper sheet 18 is led alternately over one upper and under one lower roll in its passage through the machine and is positioned so that it will come between the felt and the'surface of the rolls.

The passage of the paper'is indicated by the arrow X. The above description applies generally to all figures shown in the drawings, as this type of machine'is well known in this art. My invention lies in providing a single motor for every pair of rolls in the machine, that is the motor is adapted to drive one upper and one lower roll in' unison to assist in maintaining the surface. speeds of the felts uniform.

Referring to Figure 1, the motor 21 is mounted on a suitable surface 22' formed in the frame and is shown positioned midway or approximately so, between the centres of the upper roll .12 and the lower roll 13. The armature shaft 23 of the motor extends outwardly from each end of the motor and secured thereto by any suitable means, such as the couplings 24, are the shafts 25', rotatably mounted in bearings 26, and having secured to their ends the bevel toothed pimons 27 adapted to engage with thebevel toothed wheels 28, secured to the extended portions of the spindles 16 and 17. The bearing 26, may form part of an oil tight casing ation 0 the machine.

'motor is used for each drier roll.

motors, it will 29 surrounding the bevel wheels so that the wheels may be run in an oil bath during operationof the machine.

In Figures 3 and 4, the motor 21* is mounted on a suitably fixed bed'plate 30, and secured to the armature shaft 23 of said motor is the toothed pinion which is adapted to mesh with a tooth wheel 32 secured'to the extension of the spindle 17. As the spindle 16 has to rotate in the opposite direction to the spindle 17, the pinion 31 also meshes with a toothed idler wheel 33 which in turn meshes with a, toothed wheel'34: similar to the wheel 32, so that the rolls secured to the spindles l6 and 17 will move at uniform speed but in opposite directions of rotation to carry the paper through the machine. "lhe idler wheel may be secured to a shaft 35 rotatably mounted in suitable bearings formed in oil-tight casings 36, surrounding the pinion idlerand toothed gearwheels 34 andBZ, so that they may be roperly lubricated during the oper- In 'Figure 5, the motor 21* is mounted on a suitable surface 22 formed in the frame of the machine, and is coupled in any suitablemanner to an angularly. disposed shaft 37 which may be built in sections suitably coupled together. Secured to or formed with sections of the shaft 37, are the worms 38 and 39, which engage with worm wheels 40 and 41 secured to the spindles 15 and 16. The worm 38 maybe made with a right hand thread and the worm 39 with a left hand thread or vice-versa, to ensure that the rolls will turn opposite directions- The foregoing de;

scription is only illustrative of some types of gearing which may be employed for driving one upper and one lower drier roll by means of a single motor, and it will be readily seen that many modifications may be made in the types or trains of gears em-. ployed to transmit motion between the motor 21 and the drier roll s indles, all of. which are within the scope o my invention.

By using a single motor for each pair of drier rolls, that is one top and one bottom, the surface speed of the felts are kept at practically the same speeds, thereby eliminati'ng any tendency for the paper sheet to break through being altered from one speed to another as it passes through the machine alternately from one upper to one lower roll, a condition which exists when a single It also ensures the same surface speeds of the felts even though their tendency to stretch or shrink differ from one roll to another, as the motor forms a balancingas well as a driving means between the said upper and lower rolls.

Even though I have notshown any electrical controllin means for the separate e readily understood that said motors may be connected electrically to run independentlyof one another, or they plurality of upper drier rolls rotatably' mounted in the frame, a plurality of lower drier rolls, an upper endless felt, and guide rolls therefor, a lower endless felt and guide rolls therefor, said felts being adapted to pass over their respective drier and guide rolls, and aplurality of motors, each motor being adapted to rotate an upper and a lower roll in unison through suitable driving,

3. In a paper making machine, a frame, a

tween each pair of lower rolls, an endless upper felt passing over the upper drier rolls and under the guide rolls, an endless felt passing under the lower drier rolls and overthelowr uide rolls a luralit of (IIIVIDO' b 5 units each unit being independent of the other and adapted to drive one upper andone lower roll'in unison.

4.. In a paper making machme, a frame, having parallel rows of drier rolls rotatably mounted therein, a plurality of independent driving units each connected to drive only one roll in each row of rolls, the connection being such as to operate the different rolls in unison.

5. In a paper making machine, a frame, having two; arallel horizontal rows of drier rolls rotatab y mounted therein, a plurality of independently controlled driving units, each unit being adapted to drive two rolls, one in each row ofdrier rolls.

6. In a paper making machine, a frame having two parallel horizontal rows of drier rolls rotatably mounted therein and arranged in zig-zag manner from end to end of the machine, guide rolls between each pair of "upper and each pair of lower rolls, and

an endless felt passing over the upper drier rolls and under the guide rolls therebetween, endless felt passing under the lower drier rolls and over the guide rolls therebetween, angularly inclined means connecting each of the u per drier rolls and the lower drier roll adjacent thereto, and inde-v pendently operated means for driving each ing each upper roll with one lower-roll, and of the last mentioned means. independently electrically operated means 7. In a paper making machine, a frame foroperating-each of the aforesaid mechan- 1 having two arallel horizontal rows of drier ical means. 7 5 rolls rotata 1y mounted therein and ar-w. In Witness whereof, I have hereunto set ranged in zig-zag fashion from end to end my hand. of the machine, mechanical means. connect- BERNARD A. MALKIN. 

